Good morning! please review the operations manual of the unit for its proper set-up settings. probably, there is a defective part of the unit which should be replaced, try to bring the unit to its authorized service center. best regards.

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Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

the screen is toast. if its black and not showing whats suppose to be on the other half.if you tried restarting the computer and unplugging the monitor and it is still happening then there is nothing to do. monitors are not built to last long, the cheap ones. it is good to get one with a good warranty because the pixels go out.